Door-operating motor



1,670,535 yA. GOTTSCHALK DOOR OPERATING MOTOR Filed Sept. 15. 1919 3' Sheets-Sheet l A d MW y May 22, 1928.

May 22. 192s. O 1,670,535

A. GOTTSCHALK l DOOR OPERATING MOTOR -Filed Sept. l5. 1919 3 Sheets-Sheet. 2

, @9W @WAPCAW ing this purpose.

Patented May 22, 1928. l

unirse smras rara ALBERT Gor'rscHALx, or New tem-see Yoan, N. Y., essie-Non To NATIONAL. PNnU-iua'rrc ('JOIIHIPAIQ'Y,` O F NEW YORK, N. Y., A CORPORATION OF WEST `VIRC'lrINIA..

DoonLorERATINe Moron. i

vApplication led September 143, 19,19. Serial No. 323,656.- y

This invention relates to door operating motors, and particularly to motors of the pneumatic type. y A further object of the invention is to provide a .door` operating motor which 1s simple in structure, eiicient in operation and economical ofmanufacture. i

A further object of the .invention is to provide a door operating'motor of the character ,described wherein the control oi.V the operation thereof is'simple and eiliciently eiiected. Y f f A further object Vof the invention is to provide meansy controlled by the closing movement ofthe door .to automatically and mechanically shut oii" the supply of` Huid pressure for causing the door closing move'- ment `as distinguished from `methods kheretofore known in art which consists of pneuvmatically operated means for accomplishp'ear more :fullyv hereinafter. l

The invention consists substantially in the construction, combination, location and relative. arrangement of parts all as will be` more fully hereinafter set forth as shown in the accompanying drawings and finally pointed out in the appended claims. Referring tothe drawings':- "Fig 1` is a' view in vertical longitudinal Further objects ofthe invention will `'apsection of a door operating `motor embodying the principles of my invention. Fig..2 is an end view of the same.

Fig. 3 is an enlarged sectionaliview of the valveI end' of the motor embodying my invention. l

Fig. i is a View in side elevation, partially in section, oi:I a combined cylinder head and valve seat embodyingmy invention.

v Fig. 5y is a face view of the same.

Fig. 6 is arear view of the same.

Fig; 7 is a viewA in side elevation, partially insection, taken onv the line 7, 7, Fig. 9, of a valve employed in accordance therewith. i

Fig. 8 is a face' view of the same.

Fig. 9 is-a rear view of the same.

'Fig..10 is a view similar to Fig. l showing a slightly'modifiedl formof'my invention.'

Fig. 11 is a view in end elevation o-,the

valve control mechanism vshown in Fig.,10. Fig. '12 is a ysectional view taken on the line 12, 12, Fig. 10, looking in the direction of the'arrows. y 'I j f The same partis designated by the same reference character wherever it occurs throughout the several views. It is among the special purposes .of my presentY invention to provide a door operating motor of the pneumatic type, and espe:- ciallyv of lthe type that is known in the art as the differential motor, comprising in essence cylinders` land 2 oi different diametersl in which operaterespectively pistons 3 and 4.-,

which pistons are connected together. byv

means `of rack bar 5, which meshes with the gear segment 6 mounted on shaft 7, to which 1s secured' rod 8, the end of which is connected to the door, so that uponmovement of the pistons 3 'andll' in one direction orthe other the door movements are controlled. It is common in motors of this nature to maintain a constant supply of iiuid pressurer behind the piston of smaller diameter. In this instance Huid vpressure is supplied through pipe line 9 and through passage IO` into the,

cylinder behind the piston .4. With .thisiarrangement, and when cylinder vl is open to exhaust, iluid. pressure vbehind piston et causes the pistonsand piston rod to move toward 1the left-from the position illustrated in Fig. ll so that the door assumes its open position. When it is desired to close the door, `iuid pressure is admitted lbehind the piston Sin cylinder l so that the pressurer being equal on the respective pistons, but one v`being larger than they other, the pistons and piston rod are caused to movetoward the right into position vshown by Fig. 1. Many lvarious controlling valves and mechanism, some consisting ofgdiierential Vpiston motors superior namely, cylinder 2.

ythreads 21 of thevalve stem,

shown in Figs. 3 to 9 inclusive. The valve consists of a spindle 2O threaded at its end as at 21 and provided with a circular valve member 22 at. .its inner end. The valve member 22 has passages therein as at 23 for establishing communication between the respective'v passages hereinafter to be described. The cylinder wallof the motor is provided with a passage 24 extending throughout the length of the motor and into the cylinder 1 .through its head 25, as clearly shown in Fig. 1. The valve seat and eylinder head shown in Figs. 4, 5 and 6 comprise the valve seat portion 27, the cylinder head portion 28, provided with a passage 29 at one portion thereof in the shapeof a U to establish connection between passage 24 and the valve. It also has a passage 30 to establish connection between valve and exhaust. The stem 20 of the valve extends through the orifice 31 in the combined cylinder head and valvey scat. I also provide a lever 20 held in place by anut 32 screwing over the and between the lever and the head is interposed a spring 34 to normally maintain the valve in its proper seating position relative to its valve seat. The valve in addition to the passage 23 has a port 33 extending completely through -the same, which port is adapted 1n one position of the valve to establish communication between the ycylinder 2 andthe passage 29, to thereby enable fluid pressure to get behind the cylinder of larger diameter to close the door. Any suitable means may be employed for operating the valve, for example, a handle 40 may be secured to the valve stem and rotated in anl obvious manner to control the valve movements. From the foregoing it will be seen that when the valve is rotated by means of handle 40 so that fluid pressure is admitted into the cylinderof larger diameter behind the piston 3 the parts will assume the position shown in Fig. 1, thatis, with the door motor in its door closedfposition. When it is desired to open the door the valve spindle 20 is turned by means of the handle 10, as illustrated, so that the passage23 in the `valve will establish connection between the passages 24 and 29 and the exhaust passage 30.

jMany modifications will readily occur to those skilled in the art without departing from the spirit and scope of my invention, for example, to secure a cushioning effect of the motor at the limit of its movement the passage 24 may communicate with the cylinder 1 through restricted .port so that a cushioning effect is secured upon the opening movement of the door. Likewise, inasmuch as fluid pressure is constantly behind the piston f1 through pipe line 9, passage 10, the closing movement of the door is cushioned against fluid pressure. A further change is shown in' Fig.V 10 wherein I locate the combined valve seat andy cylinder head at the end of the cylinder of larger diameter. In this arrangement the valve generally illustrated at 6() controls the supply of fluid pressure to both cylinders and the exhaust thereof from the cylinder of larger diameter 1. Fluid pressure is supplied from the pipe line 9 to passage 61 in the valve seat and through passage 62 in valve to passage 63 in the valve seatto passage 65 in the cylinder casting, terminating 1n port 66 into the cylinder 2 of smaller diameter. At the same time passage r67 in the valve establishes communication between passage 68 terminating in passage 69 in the valve seat and the exhaust 70 in the lvalve seat. "In this yarrangement I prefer to have the door motor at the limit of its movement asv illustrated in Figel'when the door has reached its closed position, and in accordance with my invention, I propose to mount the handle 71, which controls the` valve in alignment with the door operating arm 8 so that when the door has reached the limitof its movement in its closed position the arm or handle 71 controlling the valve 60 will have been rotated a Ysufficient distance to. shut off the source of fluid pressure and thereby pre.-V

vent waste thereof. f

With the foregoing arrangement, that is, with the valve in the Vcylinder of larger diameter, and in its lap position as shownin' Fig. 12, the air contained in both cylinders vis trapped. While it is desirous tov prevent leakage from the cylinders if possible, rthere is always apt to be leakage afteruse of the motor due to the wear of the parts, and it is apparent that leakage of the trapped air in the cylinder of larger diameter alone,

ywould'cause a partial opening ofthe door.

To prevent this I make use of an equalizing port 63 in the valve to establish free communication betweenthecylinders 1 and 2 to thereby prevent a partialL opening of the door due to the leakage of the trapped air sok from the cylinder of larger dia-meter alone.

. Having now set forthythe objects and nature of my invention, and having shown and described structures embodying the principles thereof, what I claim as new and useful, and of my own inventiomand desire to secure by Letters Patent, is,

1. In a fluid pressure actuated motor, the combination with differential cylinders having a passage connecting them, pistons operating therein, va rotative valve operating within the cylinder of smaller diameter, said valve controlling said passage to `control the supply of fluid pressure toand the exhaust thereof from the cylinder of larger diameter, and means for maintaining a supply of fluid pressure behind the piston in the vcylinder of smaller diameter.

2. In a fluid pressure actuated motor, the

cylinder of larger diameter, and means for maintaining a supply of fluid pressure to '10 the cylinder of smaller diameter.

In testimony whereof I have hereunto set f myhand on this 5th day of September A. D., 1919.

ALBERT GQTTSCHALK. 

